Windows 10 and Thinkpad Pro Dock problems

Hello, I just upgrade to Windows 10, I did a clean install and everything seems to work fine, but it doesn't. I have my T450s on a Thinkpad Pro Dock 90w, with two TV's plugged in on the dock: one TV goes on the HDMI port, and the other one on the Display Port one. The problem: windows 10 is not able to output any audio from any of these ports. Actually windows does not see any possible audio coming out of any of these two ports. If use the Mini-Display Port on the left side of the laptop, then Windows quickly finds the audio and shows it on the "Playback devices" list, but pluging any of the TV's on the rear ports of the dock, the system only finds a way to display video, but no audio at all.Btw, this very same system was working perfectly on Windows 7. Has anyone noted this? Is there any firmware update coming up to solve this problem? This is a big problem for some of us... thanks a lot!! Ivan.

Thank you Skoop for your answer! 
Unfortunately no -  "Power on with AC attach" is disabled.
I didn't have much time today, but next thing I'll try is to update the BIOS and try another OS (eg a Linux live distro).
I'll report on the results!
BTW I found another thread with exactly the same symptoms but unrelated to the Docking station:
https://forums.lenovo.com/t5/R-and-L-Series-ThinkPad-Laptops/My-Thinkpad-L540-restarts-immediatly-af...

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